Vehicle: 1983 240D (w123)

Basically my front end tires are bowing out as such: /----\

Causing my tires to wear down to the belt on just the first inner 1 1/2 inch of the tread. within just a month on a new tire.


Im suspecting weak old springs causing it to stoop down, because once I slightly jack the car up releasing tension the wheel on that side straightens up.

I came to this conclusion because I own two other w123 models, that sit much higher that the one in question. and the tires are straight as an arrow.

Is this a reasonable diagnosis or am i looking at replacing the (expletive) balljoints?